[skissane]

When I saw the title about "TLS Callbacks", I immediately knew what kind of TLS the article was talking about. But then when I saw the comment on ERR_SSL_VERSION_OR_CIPHER_MISMATCH – at the time there weren't many others – and I started to doubt myself – has TLS the network protocol added some new feature called "callbacks" that I'm unfamiliar with?

[junon]

Some libraries use callbacks for e.g. host certificate verification so the consuming application can manage its own whitelists.